CN213331008U - Mechanical self-checking packer - Google Patents

Abstract

The utility model provides a mechanical self-checking packer, which is additionally provided with a group of upper rubber sleeve groups on the basis of the traditional packer, and a fixed sleeve and a communication sleeve are additionally arranged between the upper rubber sleeve group and the lower rubber sleeve group; a sliding spline fixed at the lower end of the upper joint and a sliding key chute on the inner wall of the fixed sleeve form a sliding pair and can transmit torque; a pressure transmission hole is processed on the communicating sleeve and is used for communicating the central channel 20 with an annular space in the sleeve; when the device works, the leakage detection function of the casing can be realized only by connecting any ball seat with the same size; meanwhile, the sleeve is convenient to unseal and can be repeatedly used under the condition that a plurality of leakage tests of the sleeve are needed; the structure is simple, and the packer can be used with part of parts of the RTTS packer; the device can be repeatedly used for multiple times, and multiple parts of the sleeve are sequentially subjected to leakage testing and channeling testing; the setting condition of the packer can be explained in detail only by connecting a ball seat, and the reason for incomplete setting is judged to be incomplete cementing or casing leakage; when the ball seat is not connected, the packer can be used as a common packer, and the universality is strong.

Description

Mechanical self-checking packer

Technical Field

The utility model belongs to the oil well separator among the oil field production facility especially relates to an oil well is from sealing device who tests a.

Background

In the development and production of oil and gas fields, the packer is used as a common tool and is widely applied to production operations such as production well zonal testing, zonal oil production, zonal water injection, water layer plugging and the like. Currently, in conventional production, a common packer adopts a design that a limit sliding slip-fit steering mechanism is arranged below a rubber sleeve, such as an RTTS (Y221) packer. When the packer works, the pipe column is lifted and lowered to rotate forwards, the rotating mechanism pushes the slips to be anchored, the rubber sleeve is extruded by the gravity of the packer to seal, the structure is simple, and the phenomenon of sand burying of the slips is avoided. However, when performing a packing operation, it is difficult to verify the packing effect using this packer. Therefore, a mechanical separator is usually used for verifying the sealing effect of the packer, but the mechanical packer can only judge whether the packer is sealed or not through pressure change by annular pressure after setting. When annulus pressure cannot stabilize, it is difficult to determine if casing is lost or the packer is not fully set.

Disclosure of Invention

The utility model aims to overcome the defects of the prior packer, and provides a mechanical self-checking packer which is additionally provided with a group of upper rubber sleeve groups on the basis of the traditional packer and a fixed sleeve and a communication sleeve between the upper rubber sleeve group and the lower rubber sleeve group; a sliding spline fixed at the lower end of the upper joint and a sliding key chute on the inner wall of the fixed sleeve form a sliding pair and can transmit torque; a pressure transmission hole is processed on the communicating sleeve and is used for communicating the central channel 20 with an annular space in the sleeve; when the device works, the leakage detection function of the casing can be realized only by connecting any ball seat with the same size; convenient deblocking simultaneously, repeatedly usable under the condition that need carry out the sleeve pipe multiple spot and test the hourglass.

The utility model discloses a mechanical type self-checking packer, including top connection (1), from top to bottom suit last catch (2) and holding ring (3) on top connection (1), still include center tube (10), from top to bottom assemble the compression ring (11), lower rubber sleeve group (12), lower catch ring (13), slip seat (14), slips (15), friction reversing sleeve (16) and friction disc (17) on center tube (10);

a group of upper rubber cylinder groups (4) and a bearing ring (5) matched with the upper rubber cylinder groups are added at the lower part of the positioning ring (3);

a fixed sleeve (7) and a communication sleeve (8) are additionally arranged on the upper part of the central pipe;

the upper part of the fixed sleeve (7) is in threaded connection with the pressure-bearing ring (5), the lower part of the fixed sleeve is in threaded connection with the upper part of the communicating sleeve (8), the inner wall of the fixed sleeve (7) is provided with a sliding key chute (19) corresponding to the sliding spline (6), the lower end of the sliding key chute (19) in the fixed sleeve (7) is provided with a positioning boss (21) with a lower limit of positioning stroke, a tooth-shaped sliding spline (6) is arranged between the fixed sleeve (7) and the upper joint (1), the sliding spline (6) is sleeved at the lower end of the upper joint (1) and is fixedly connected into a whole through threads, convex teeth (22) of the sliding spline (6) and sliding key sliding grooves (19) on the inner wall of the fixed sleeve (7) are in one-to-one correspondence to form sliding pairs, and the whole sliding spline (6) can slide up and down in the sliding key sliding grooves (19) and transmit torque to the fixed sleeve (7) through the rotation of the upper joint (1);

a space for the compression stroke of the upper rubber cylinder group is reserved between the lower end of the upper joint (1) and the upper end surface of a positioning boss (21) in the fixed sleeve (7);

a communicating sleeve (8) is additionally arranged between the fixed sleeve (7) and the compression ring (11), the lower part of the communicating sleeve is in threaded connection with the central pipe (10), a through pressure transfer hole (9) is formed in the side wall of the communicating sleeve (8), one end of the communicating sleeve is communicated with the space of the sleeve outside the separator, and the other end of the communicating sleeve is communicated with the central channel (20).

The length of the sliding key sliding groove (19) in the fixed sleeve (7) is based on meeting the compression stroke of the upper rubber cylinder group (4).

Compare traditional self-checking packer, the beneficial effects of the utility model are that:

1. the structure is simple, and the packer can be used with part of parts of the RTTS packer;

2. the device can be repeatedly used for multiple times, and multiple parts of the sleeve are sequentially subjected to leakage testing and channeling testing;

3. the setting condition of the packer can be explained in detail only by connecting a ball seat, and the reason for incomplete setting is judged to be incomplete cementing or casing leakage; when the ball seat is not connected, the packer can be used as a common packer, and the universality is strong.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention A-A;

FIG. 3 is a schematic cross-sectional view of the present invention taken along line B-B;

fig. 4 is a schematic cross-sectional view of the present invention.

In the figure: 1. the device comprises an upper joint, 2, an upper locking ring, 3, a positioning ring, 4, an upper rubber barrel group, 5, a pressure bearing ring, 6, a sliding spline, 7, a fixing sleeve, 8, a communicating sleeve, 9, a pressure transmitting hole, 10, a central pipe, 11, a compression ring, 12, a lower rubber barrel group, 13, a lower locking ring, 14, a slip seat, 15, a slip, 16, a friction reversing sleeve, 17, a friction plate, 18, a spring, 19, a sliding key sliding groove, 20, a central channel, 21, a positioning boss, 22, a convex tooth, 23, a pin, 24 and a J-shaped reversing groove.

Detailed Description

In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, it is right to combine the embodiment below the utility model discloses carry out detailed explanation. The embodiments of the present invention are presented to facilitate better understanding, but are not limiting of the present invention.

The utility model relates to a mechanical self-checking packer, which is a novel mechanical self-checking packer invented by technical improvement of the mechanical packer widely used at present (for example, RTTS (Y221) packer);

as shown in fig. 1, the main structure of a mechanical self-seal-testing packer comprises an upper joint 1, a central pipe 10 and a plurality of matched functional components assembled on the upper joint; on the top connection 1, from top to bottom the cover is equipped with catch 2, holding ring 3, wherein: the upper lock ring 2 is fixed with the upper joint 1 in a threaded connection mode; an internal thread for connecting with an oil pipe is processed inside the upper end of the upper joint 1; a compression ring 11, a lower rubber cylinder group 12, a lower locking ring 13, a slip seat 14, slips 15, a friction reversing sleeve 16 and a friction plate 17 are assembled on the central tube 10 from top to bottom; the technical improvement of the utility model lies in: a pair of pressure bearing rings 5 are additionally arranged below the positioning ring 3, a group of upper rubber cylinder groups 4 are additionally arranged between the positioning ring 3 and the pressure bearing rings 5 and sleeved on the upper joint 1, and the upper rubber cylinder groups 4 are additionally arranged to form a closed space between the upper rubber cylinder groups and the lower rubber cylinder groups in the sleeve space after the upper rubber cylinder groups and the lower rubber cylinder groups are extruded, so that the setting is realized; a pair of fixed sleeves 7 are additionally arranged between the pressure-bearing ring 5 and the communication sleeve 8, the upper parts of the fixed sleeves 7 are fixed with the pressure-bearing ring 5 in a threaded connection mode, the lower parts of the fixed sleeves 7 are fixed with the upper part of the communication sleeve 8 in a threaded connection mode, and the fixed sleeves 7 are used for pushing the pressure-bearing ring 5 to extrude the upper rubber sleeve group 4 through the relative movement of the upper joint 1 to realize setting; a communicating sleeve 8 is additionally arranged between the fixed sleeve 7 and the compression ring 11, the upper part of the communicating sleeve is fixed with the fixed sleeve 7 in a threaded connection mode, the lower part of the communicating sleeve is fixed with the central pipe 10 in a threaded connection mode, and the communicating sleeve 8 has the function of realizing the balance of a sealed space between the upper and lower groups of rubber cylinder groups and the pressure in the connecting pipe column on the packer by utilizing a pressure transfer hole 9 on the side wall of the communicating sleeve 8;

as shown in fig. 2A-a and fig. 3B-B, a sliding key chute 19 corresponding to the sliding spline 6 is arranged on the inner wall of the fixing sleeve 7, and the length of the sliding key chute 19 is based on the requirement of satisfying the compression stroke of the upper rubber barrel group 4; a positioning boss 21 with a lower limit of a positioning stroke is arranged at the lower end of the sliding key chute 19 in the fixed sleeve 7; a tooth-shaped sliding spline 6 is arranged between the fixed sleeve 7 and the upper joint 1, convex teeth 22 of the sliding spline 6 and sliding key sliding grooves 19 form sliding pairs in a one-to-one correspondence mode, the whole sliding spline 6 can slide up and down in the sliding key sliding grooves 19, and torque can be transmitted to the fixed sleeve 7 through rotation of the upper joint 1; the sliding spline 6 is sleeved at the lower end of the upper joint 1 and is fixedly connected into a whole through threads; a corresponding compression stroke space is reserved between the lower end of the upper joint 1 and the upper end face of the positioning boss 21 in the fixed sleeve 7, the sliding sleeve 7 is connected with the upper joint 1 through a sliding spline 6, and the pressure-bearing ring 5 is driven to extrude the mechanical structure for setting through the relative movement of the upper joint 1;

as shown in fig. 4C-C, a pressure transfer hole 9 is opened on the sidewall of the communicating sleeve 8, one end of which communicates with the space of the casing outside the separator, and the other end communicates with the central passage 20;

the utility model discloses a slip bowl 14, slips 15, friction switching-over sleeve 16 and friction disc 17 use and have the packer slips friction switching-over structure of sealing certainly now, and processing has J type switching-over groove 24 in the friction switching-over sleeve 16, is fixed with pin 23 on its inside center tube 10, thereby lower part friction disc 17 and inside center tube 10 spring 18 can provide sufficient frictional force when the instrument rotates and make center tube 10 produce relative rotation and remove assigned position with pin 23.

The mechanical self-seal-checking packer can realize the functions of seal checking, casing pipe channeling checking and leakage checking;

the utility model discloses a mechanical type is from examining sealing packer's theory of operation as follows:

the rig floor is connected mechanical type and is examined and seal packer and ball seat back and bore down to assigned position, wherein: the ball seat at the lower part plays the role of a one-way valve, when the external pressure of the ball seat is high, a spherical switch in the ball seat is opened, the lower part of the packer central tube 10 is communicated, and when the internal pressure of the ball seat is high, the lower part of the packer central tube 10 is closed;

when the packer works, the mechanical self-seal checking packer is lifted to the height required by setting, and the mechanical self-seal checking packer is slowly rotated forwards and downwards; at the moment, the pin 23 on the central tube 10 moves along the J-shaped reversing groove 24 to unlock the slips 15, meanwhile, the downward operation pushes the slips 15 to anchor the inner wall of the casing, and the upper rubber sleeve group 4 and the lower rubber sleeve group 12 are extruded by the weight of the upper pipe column to complete setting;

in leak testing a casing, the annulus between the outside of the packer and the casing is first pressurized at the surface. When the casing is lost or the setting is incomplete, the air in the annulus is conducted to the central channel 20 in the packer through the unsealed upper rubber sleeve 4 and the pressure transmission hole 9 in the communication sleeve 8 by the pressure at the moment and returns to the oil pipe upwards, or is transmitted to the surrounding stratum through the damaged casing, so that the phenomenon of liquid return through a water hole or unstable pressure of the annulus is caused. Then, positively pressing the oil pipe, wherein the packing space between the two groups of rubber cylinders is communicated with the oil pipe at the wellhead through a pressure transfer hole 9, and if the pressure data of the oil pipe is stable, the packer is normally set and the casing pipe is leaked; otherwise, the setting is not complete, and the setting needs to be selected again;

when the packer is unset, the oil pipe is lifted, the central pipe 10 moves upwards, the upper rubber sleeve 4 and the lower rubber sleeve 12 rebound, and the slips 15 are retracted. If other positions need to be tested for leakage and channeling, the packing operation can be repeatedly carried out. The device generally has a seal-testing pressure of 15 MPa.

The utility model discloses a mechanical type is from examining packer's work flow as follows:

1. after the upper pipe column is connected with the packer and is lowered to a set position, the packer is lifted upwards and rotates clockwise, and the outer slip and the inner central pipe generate relative rotation under the action of the friction plate 17 so as to move a central pipe 10 pin in the J-shaped steering mechanism 16 to an unlocking position for unlocking;

2. after unlocking, the upper pipe column is lowered, the slips 15 extend out of the slip seat 14, and the whole packer is anchored in the external casing;

3. continuing to lower the oil pipe, wherein the lower part of the packer is anchored by the slips 15, the oil pipe drives the upper joint 1 to slide downwards in the fixed sleeve 7, and meanwhile, the central pipe 10 is pushed to move downwards, and the lowered packer gravity enables the lower rubber sleeve group 12 to deform under the action of gravity to seal;

4. further continuing to lower the oil pipe, fixing the position of a pressure-bearing ring 5 at the lower part of the upper rubber cylinder group 4, moving the upper joint 1 downwards, and extruding a positioning ring 3 fixed on the upper joint 1 through a locking ring 2 and the pressure-bearing ring to enable the upper rubber cylinder group 4 to deform for packing;

5. when the seal is tested, the pressure transmitting hole 9 of the communicating sleeve 8 communicates the sealed space of the rubber sleeve with the oil pipe, and the pressure in the sealed space can be directly obtained through the oil pipe, so that the setting effect and the leakage condition of the sleeve can be accurately explained; pressurizing an annular space of an oil sleeve outside the packer on the ground, and if the annular unstable pressure phenomenon is generated, indicating that partial sleeve on the packer is damaged and causes leakage due to no liquid return of a water hole; if the water hole returns, the water hole may be caused by that the pressure enters the central channel 20 through the pressure transfer hole 9 in the communicating sleeve 8 due to incomplete setting of the rubber sleeve, so that the water hole returns on the ground, or the pressure is transferred to the lower annular space through the stratum by the upper sleeve and the lower sleeve of the packer due to leakage, so that the water hole returns to the central channel 20 through the lower ball seat by the upper sleeve; at the moment, the packer is subjected to self-checking sealing for completely explaining the packing condition, the packing space between two groups of rubber cylinders is communicated with the upper pipe column through a pressure transfer hole 9, the oil pipe is positively pressurized, if the pressure of the central pipe column is stable, the packer is completely set, the leakage of a sleeve is indicated, otherwise, the packer is incompletely sealed, and the setting needs to be selected again;

6. when the packer is unpacked, the oil pipe is lifted, the central pipe 10 moves upwards, the upper rubber sleeve group 4 and the lower rubber sleeve group 12 rebound, and the slips 15 are retracted. If other positions need to be tested for leakage and channeling, the packing operation can be carried out again. The device generally has a seal-testing pressure of 15 MPa.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the claims of the present invention. While the foregoing description will be understood and appreciated by those skilled in the relevant art, other equivalents may be made thereto without departing from the scope of the claims.

Claims (2)

1. The utility model provides a mechanical type is from examining and is sealed packer, includes top connection (1) and from last lock ring (2) and holding ring (3) of suit on top connection (1) down, still includes center tube (10) and from last compression ring (11), lower rubber sleeve group (12), lower lock ring (13), slip seat (14), slips (15), friction switching-over sleeve (16) and friction disc (17) of assembling on center tube (10) down, its characterized in that: a group of upper rubber cylinder groups (4) and a bearing ring (5) matched with the upper rubber cylinder groups are added at the lower part of the positioning ring (3); a fixed sleeve (7) and a communication sleeve (8) are additionally arranged on the upper part of the central pipe; the upper part of the fixed sleeve (7) is in threaded connection with the pressure-bearing ring (5), the lower part of the fixed sleeve is in threaded connection with the upper part of the communicating sleeve (8), the inner wall of the fixed sleeve (7) is provided with a sliding key chute (19) corresponding to the sliding spline (6), the lower end of the sliding key chute (19) in the fixed sleeve (7) is provided with a positioning boss (21) with a lower limit of positioning stroke, a tooth-shaped sliding spline (6) is arranged between the fixed sleeve (7) and the upper joint (1), the sliding spline (6) is sleeved at the lower end of the upper joint (1) and is fixedly connected into a whole through threads, convex teeth (22) of the sliding spline (6) and sliding key sliding grooves (19) on the inner wall of the fixed sleeve (7) are in one-to-one correspondence to form sliding pairs, the whole sliding spline (6) can slide up and down in the sliding key sliding grooves (19), and transmits torque to the fixed sleeve (7) through the rotation of the upper joint (1); a space for the compression stroke of the upper rubber cylinder group is reserved between the lower end of the upper joint (1) and the upper end surface of a positioning boss (21) in the fixed sleeve (7); a communicating sleeve (8) is additionally arranged between the fixed sleeve (7) and the compression ring (11), the lower part of the communicating sleeve is in threaded connection with the central pipe (10), a through pressure transfer hole (9) is formed in the side wall of the communicating sleeve (8), one end of the communicating sleeve is communicated with the space of the sleeve outside the separator, and the other end of the communicating sleeve is communicated with the central channel (20).

2. The mechanical self-seal-testing packer of claim 1, wherein: the length of the sliding key sliding groove (19) in the fixed sleeve (7) is based on meeting the compression stroke of the upper rubber cylinder group (4).

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